Bond strength prediction for reinforced concrete members with highly corroded reinforcing bars

Lan Chung, Jang Ho Jay Kim, Seong Tae Yi

Research output: Contribution to journalArticlepeer-review

80 Citations (Scopus)

Abstract

Due to the shortage of natural fine aggregates in many countries, sea sand has been alternatively used in the production of concrete. However, due to the presence of chlorides in sea sand, the threat of corrosion of steel reinforcing bars embedded in such concrete has become a major concern. Therefore, many studies related to corrosion level and bond behavior have been performed. The realistic corrosion levels at which the aged structures are exposed to danger are usually greater than 1% and beyond minimal 2%. Since safety predictions of aged concrete structures based on corrosion failure are of the utmost importance, research concerning more realistic corrosion levels would help the prediction process. For this purpose, two types of specimens are investigated to understand the bond properties as a function of corrosion level in RC members. Prismatic concrete specimens with reinforcements subjected to corrosion before and after casting of concrete are used for pullout tests. Based on the experimental data, an equation for bond strength prediction is developed. Also, the validity of the proposed equation is demonstrated through comparison with the existing prediction curves.

Original languageEnglish
Pages (from-to)603-611
Number of pages9
JournalCement and Concrete Composites
Volume30
Issue number7
DOIs
Publication statusPublished - 2008 Aug

Bibliographical note

Funding Information:
The authors wish to acknowledge the financial support of the Korea Science and Engineering Foundation (KOSEF) for the National Research Laboratory (NRL) project M01-0203-00-0068. The third author also wishes to thank the partial financial support of the project “Development of Intelligent Port and Logistics System for Super-Large Container Ships,” which was sponsored by Ministry of Maritime and Fishery in Korea. These supports are deeply appreciated.

All Science Journal Classification (ASJC) codes

  • Building and Construction
  • Materials Science(all)

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